Annu Int Conf IEEE Eng Med Biol Soc. 2021 Nov;2021:7316-7319. doi: 10.1109/EMBC46164.2021.9630105.
Continuous, non-invasive wearable measurement of metabolic biomarkers could provide vital insight into patient condition for personalized health and wellness monitoring. We present our efforts towards developing a wearable solar-powered electrochemical platform for multimodal sweat based metabolic monitoring. This wrist-worn wearable system consists of a flexible photovoltaic cell connected to a circuit board containing ultra low power circuitry for sensor data collection, energy harvesting, and wireless data transmission, all integrated into an elastic fabric wristband. The system continuously samples amperometric, potentiometric, temperature, and motion data and wirelessly transmits these to a data aggregator. The full wearable system is 7.5 cm long and 5 cm in diameter, weighs 22 grams, and can run directly from harvested light energy. Relatively low levels of light such as residential lighting (∼200 lux) are sufficient for continuous operation of the system. Excess harvested energy is stored in a small 37 mWh lithium polymer battery. The battery can be charged in ∼14 minutes under full sunlight and can power the system for ∼8 days when fully charged. The system has an average power consumption of 176 µW. The solar-harvesting performance of the system was characterized in a variety of lighting conditions, and the amperometric and potentiometric electrochemical capabilities of the system were validated in vitro.Clinical relevance-The presented solar-powered wearable system enables continuous wireless multi-modal electrochemical monitoring for uninterrupted sensing of metabolic biomarkers in sweat while harvesting energy from indoor lighting or sunlight.
连续、非侵入式的可穿戴代谢生物标志物测量可以为患者的病情提供重要的洞察，实现个性化的健康和保健监测。我们展示了开发一种用于基于多模态汗液的代谢监测的可穿戴太阳能电化学平台的努力。这个戴在手腕上的可穿戴系统由一个柔性光伏电池组成，连接到一个电路板上，电路板包含超低功耗电路，用于传感器数据采集、能量收集和无线数据传输，所有这些都集成在一个弹性织物腕带中。该系统可连续采集安培计、电位计、温度和运动数据，并将这些数据无线传输到数据聚合器。完整的可穿戴系统长 7.5 厘米，直径 5 厘米，重 22 克，可直接从采集到的光能量运行。像住宅照明（约 200 勒克斯）这样的低水平光线就足以满足系统的连续运行。多余的能量储存在一个小的 37 毫瓦时的锂聚合物电池中。电池在完全阳光照射下可以在大约 14 分钟内充满电，充满电后可以为系统供电约 8 天。该系统的平均功耗为 176 微瓦。系统的太阳能收集性能在各种照明条件下进行了表征，并且系统的安培计和电位计电化学性能在体外得到了验证。临床意义-所提出的太阳能可穿戴系统能够在从室内照明或阳光中收集能量的同时，实现连续的无线多模态电化学监测，以不间断地感测汗液中的代谢生物标志物。
